This multipack contains the four toughest, most resistant 1.5m long Thera-Bands (extra heavy, special heavy, super heavy and max heavy) making it even easier to up the resistance level as training or rehabilitation programme develops . Training with elastic resistance is also easier on the joints and less likely to cause injuries than training with weights. Thera-Bands are also light and easily transported simplifying the integration of an exercise programme into any lifestyle. They can be taken along for use while travelling, at home or even in the office.